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+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iommu/arm,smmu-v3.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ARM SMMUv3 Architecture Implementation
+
+maintainers:
+ - Will Deacon <will@kernel.org>
+ - Robin Murphy <Robin.Murphy@arm.com>
+
+description: |+
+ The SMMUv3 architecture is a significant departure from previous
+ revisions, replacing the MMIO register interface with in-memory command
+ and event queues and adding support for the ATS and PRI components of
+ the PCIe specification.
+
+properties:
+ $nodename:
+ pattern: "^iommu@[0-9a-f]*"
+ compatible:
+ const: arm,smmu-v3
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ minItems: 1
+ maxItems: 4
+
+ interrupt-names:
+ oneOf:
+ - const: combined
+ description:
+ The combined interrupt is optional, and should only be provided if the
+ hardware supports just a single, combined interrupt line.
+ If provided, then the combined interrupt will be used in preference to
+ any others.
+ - minItems: 2
+ maxItems: 4
+ items:
+ - const: eventq # Event Queue not empty
+ - const: gerror # Global Error activated
+ - const: priq # PRI Queue not empty
+ - const: cmdq-sync # CMD_SYNC complete
+
+ '#iommu-cells':
+ const: 1
+
+ dma-coherent:
+ description: |
+ Present if page table walks made by the SMMU are cache coherent with the
+ CPU.
+
+ NOTE: this only applies to the SMMU itself, not masters connected
+ upstream of the SMMU.
+
+ msi-parent: true
+
+ hisilicon,broken-prefetch-cmd:
+ type: boolean
+ description: Avoid sending CMD_PREFETCH_* commands to the SMMU.
+
+ cavium,cn9900-broken-page1-regspace:
+ type: boolean
+ description:
+ Replaces all page 1 offsets used for EVTQ_PROD/CONS, PRIQ_PROD/CONS
+ register access with page 0 offsets. Set for Cavium ThunderX2 silicon that
+ doesn't support SMMU page1 register space.
+
+required:
+ - compatible
+ - reg
+ - '#iommu-cells'
+
+additionalProperties: false
+
+examples:
+ - |+
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+ #include <dt-bindings/interrupt-controller/irq.h>
+
+ iommu@2b400000 {
+ compatible = "arm,smmu-v3";
+ reg = <0x2b400000 0x20000>;
+ interrupts = <GIC_SPI 74 IRQ_TYPE_EDGE_RISING>,
+ <GIC_SPI 75 IRQ_TYPE_EDGE_RISING>,
+ <GIC_SPI 77 IRQ_TYPE_EDGE_RISING>,
+ <GIC_SPI 79 IRQ_TYPE_EDGE_RISING>;
+ interrupt-names = "eventq", "gerror", "priq", "cmdq-sync";
+ dma-coherent;
+ #iommu-cells = <1>;
+ msi-parent = <&its 0xff0000>;
+ };